MIA Toolbox PCA Quick Start: Difference between revisions

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[[Loading Data Quick Start | Previous Topic: Loading Data]]
[[MIA_Toolbox_Loading_Data_Quick_Start | Previous Topic: Loading Image Data]]
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[[Image:LoadExportSMBread.png |right |(Click to Enlarge)]]
[[Image:LoadExportSMBread.png |right | 500px |(Click to Enlarge)]]
This example uses the '''smbread''' dataset. Load '''smbread''' by clicking on '''Load Demo Data''' in the tree, then '''Swedish Knackerbrod'''. This will load the data into Image Manager. Click on the item in the Loaded Images section to view it and make it the current selected image. Next, click on the export to Analysis button. This will open the Analysis GUI and load '''smbread'''.
This example uses the '''smbread''' dataset. Load '''smbread''' by clicking on '''Load Demo Data''' in the tree, then '''Swedish Knackerbrod'''. This will load the data into Image Manager. Click on the item in the Loaded Images section to view it and make it the current selected image. Next, click on the export to Analysis button. This will open the Analysis GUI and load '''smbread'''.
by selecting File/Import Data.../Workspace/MAT file. Click the '''From File''' button, type "arch" into the '''File:''' text box, and then hit the Return key. Because '''arch''' is on the path, the importer will locate the arch.mat file and show its variables. Click '''Load''' and the data will be available in the "Browser".
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[[Image:build_model.003.png |right| 500px |(Click to Enlarge)]]
[[Image:CalcPCAImage.png |right| 500px |(Click to Enlarge)]]
Once data has been loaded into the workspace, there are several ways to begin building a model.  For analysis tools like PCA where only an '''X''' block is required, you can right-click on the data icon in the '''Browser''' to reveal a list of analysis options. You can also drag the given data to an analysis method shortcut, such as the Decompose '''PCA''' shortcut.
The Analysis interface will open with '''smbread''' loaded. Next, select '''PCA''' from the '''Analysis''' menu and then click the '''Model''' icon in the Status Pane.
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[[Image:build_model.004.png |right| 500px |(Click to Enlarge)]]
The Analysis GUI will then appear with the given data already loaded. (The large '''X''' (block) button in the Analysis GUI will appear depressed indicating the data is loaded - passing the cursor over the button will provide a summary of the '''X''' block data.)
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[[Image:build_model.005.png |right| 500px |(Click to Enlarge)]]
[[Image:RecalcBreadImage4PCs.png |right| 500px |(Click to Enlarge)]]
While each analysis type has its own nuances, in general the steps to build a model are:
By default a model with one PC will be calculated. Try '''4 PCs''' by selecting row 4 and clicking the '''Model''' icon again.


# load the data
For a more detailed discussion of building models, see [[Building_Models_Quick_Start|here]].
# view the data
# choose preprocessing
# select the type of cross-validation to use (if any is desired - see [[Using Cross-Validation]])
# build the model
# review the model
 
There is more than one way to accomplish each of the above steps.  For example, preprocessing can be set for the '''X''' block by
* clicking the '''"Choose Preprocessing"''' button in the Analysis Flowchart
* clicking the '''P''' button next to the '''X''' button
* select '''"Preprocess"''' menu item
 
('''Hint:''' Once selected, use the Preprocess/X-block and Preprocess/Y-block menus to save the current preprocessing as the default.)
 
You can quickly view your data by right-clicking on the appropriate button ('''X''' or '''Y''') and then select '''"Plot Data"'''
 
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[[Image:build_model.006.png|right|  |(Click to Enlarge)]]
Perhaps the quickest way for new users to complete the remaining steps to build the model is to use the flowchart.  


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[[Review Results Quick Start | Next Topic: Review Results]]
[[MIA_Toolbox_Review_Results | Next Topic: Review Results]]

Latest revision as of 17:32, 15 October 2009

Previous Topic: Loading Image Data

(Click to Enlarge)

This example uses the smbread dataset. Load smbread by clicking on Load Demo Data in the tree, then Swedish Knackerbrod. This will load the data into Image Manager. Click on the item in the Loaded Images section to view it and make it the current selected image. Next, click on the export to Analysis button. This will open the Analysis GUI and load smbread.

(Click to Enlarge)

The Analysis interface will open with smbread loaded. Next, select PCA from the Analysis menu and then click the Model icon in the Status Pane.

(Click to Enlarge)

By default a model with one PC will be calculated. Try 4 PCs by selecting row 4 and clicking the Model icon again.

For a more detailed discussion of building models, see here.

Next Topic: Review Results

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